Rolled spike



m Z. M 3 j. ,6 .4 M 6% H. A. HARVEY. ROLLED SPIKE.

UNITED STATES PATENT OFFICE.

IIAYW ARD A. HARVEY, OF ORANGE, NE\V JERSEY.

ROLLED SPIKE.

SPEGIFIGATIOH forming part of Letters Patent No. 456,723, dated July 28,1891.

Application filed January 19. 1889. Serial No. 296,814- (No model.)

except that the middle portions of the ribs are To all whom it mayconcern.-

Be it known that I, HAYWARD A. HARVEY, of Orange,New Jersey,haveinvented certain Improvements in Rolled Spikes, of which the followingis a specification.

This invention is an improvement upon the rolled spikes shown anddescribed in United States PatentNo. 395,898, issued to Hayward A.Harvey January 8, 1889, one of the peculiarities of which spike is thatit has a chiselpoint which is slightly narrower than the diameter of theadjoining cylindrical part of the shank. It is found that when suchspikes are driven into certain kinds of wood they have a tendency toturn on their longitudinal axes. In the present invention such tendencyis corrected by the presence of a series of parallel longitudinal ribs,which are formed along a portion of the shank of the spike in the act ofrolling it between suitablyshaped rollingdies. The ribs project butslightly from the shank of the spike, or, in other words, the groovesbetween the ribs are comparatively shallow. The natural resilience ofthe Wood into which the spike is driven suffices to make it. hug theentire periphery of the embedded portion of the shank. Thus thelongitudinally-ribbed spike is possessed of the superior holdingqualities of the rolled spike shown and described in the patent abovereferred to, and is also prevented from turning upon its longitudinalaxis when it is being driven. v

The accompanying drawings, illustrating the application of the inventionto railroadspikes, are as follows:

Figure 1 is an elevation of a spike having longitudinal ribs only uponthe middle portion of its ShtlllQWhlCh is of smaller diameter than theadjoining portion. Fig. 2 is a transverse section taken through theplane indicated by the line a: :r on Fig. 1. Fig. 3 is a transversesection taken through the plane indicated by the line y g on Fig. 1.Fig. lis a longitudinal section taken through the plane indicated by theline on Fig. 1. Fig.

5 is a longitudinal section similar to Fig. 4,

represented as extending farther out from the body. Fig. (3 is atransverse section taken through the plane indicated by the line 00' :c'on Fig. 5.

Referrin to the railroad-spike shown in the drawings it will be seenthat in each case the shank A is provided with the usual offsethead Band with the chisel-point C, which is slightly narrower than theadjoining cylindrical portion of the shank.

In the spike shown in Fig. 1 only the middle portion D of the shank isprovided with the parallel longitudinal ribs E. The grooves 6 betweenthe ribs E gradually diminish in depth toward the ends 6 and 6respectively, where the ribs E terminate. It will be seen that the coreof the ribbed portion D is of smaller diameter than the portion F of theshank adjoining the point, while the extreme diameter, measuring throughthe ribs E, is the same as the diameter of the enlarged portion F of theshank. In the spike represented in Fig. 5 the middle portions of theribs E extend farther out from the body, so that the apex of each rib isslightly curved in the 1011- gitudinal plane, as shown in'Fig. 0. Itwill be obvious that the ribs may be varied in form and extent in manyother ways without departing from the invention.

hat is claimed as the invention is-- 1.. A rolled spike provided uponthe middle portion only of its shank with a series of longitudinal ribsprojecting outwardly beyond the normal periphery of the shank,substantially as described.

2. A rolled spike having a chisel-point slightly narrower than theadjoining cylin drical portion of the shank and having the middleportion only of its shank provided with a series of longitudinal ribs,substam tially as described.

llAYlVARD A. HARVEY. Witnesses;

EDVV. E. QUIMBY, A. M. J oNEs.

